Vented gaseous deflagrations: modelling of translating inertial vent covers |
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| Institution: | 1. State Key Laboratory for Advanced Special Steels (Shanghai University) and Shanghai Institute of Applied Mathematics and Mechanics, Yanchang Road 149, 200072 Shanghai, China;2. College of Mathematics and Information Sciences, Weifang University, Weifang 261061, Shandong Province, China;1. College of Mathematical Sciences, Chongqing Normal University, Chongqing 401331, PR China;2. College of Computer and Information Science, Chongqing Normal University, Chongqing 401331, PR China |
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| Abstract: | A model of explosion pressure build up in enclosures with translating inertial vent covers is presented. The previous approach, valid for inertia-free vents, is advanced by appending to it a new model of translating inertial vent cover displacement. The model and CINDY code are validated against experiments by Höchst and Leuckel (J. Loss Prev. Process Ind. 11 (1998) 89) in a 50-m3 vessel with vertically translating covers with surface densities of 42 and 89 kg/m2 at conditions of initially quiescent and turbulent mixtures. It is demonstrated for the first time that modelling of the vent cover jet effect is crucial for prediction of interdependent pressure-time and cover displacement-time transients, whereas air drag force and cushioning effects are negligible. The model was used further to investigate the influence of vent cover surface density on venting generated turbulence, via comparisons with experimental data of Cooper et al. (Combust. Flame 65 (1986) 1) in a 1-m3 enclosure with vertically translating covers of various surface densities up to 200 kg/m2. The increase of the turbulence factor, i.e. total premixed flame front wrinkling factor, with cover inertia is obtained and explained. |
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